Blazor tutorial missing project files; .slnx created instead of .sln

### URL

https://dotnet.microsoft.com/en-us/learn/aspnet/blazor-tutorial/intro

### Operating system

windows 11

### More information about your system

_No response_

### Description

When following the Blazor tutorial on the official Microsoft site, I am not seeing all the project files mentioned in the guide. Specifically:
When creating a new project, I select a .sln file, but Visual Studio creates a .slnx file instead.
The tutorial mentions additional files/extensions like the Blazor app template, but they do not appear in my IDE.
I cannot locate the extra project template/extension mentioned in the guide.

### dotnet --info

ПАКЕТ SDK ДЛЯ .NET:
Version: 10.0.100
Commit: b0f34d51fc
Workload version: 10.0.100-manifests.4c0ca8ba
MSBuild version: 18.0.2+b0f34d51f

Среда выполнения:
OS Name: Windows
OS Version: 10.0.26200
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\10.0.100\

Установленные рабочие нагрузки .NET:
Нет установленных рабочих нагрузок для отображения.
Настроено на использование workload sets при установке новых манифестов.
Наборы рабочих нагрузок не установлены. Запустите команду "dotnet workload restore", чтобы установить набор рабочей нагрузки.

Host:
Version: 10.0.0
Architecture: x64
Commit: b0f34d51fc

.NET SDKs installed:
10.0.100 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 10.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 10.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 10.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
None

Environment variables:
Not set

global.json file:
Not found

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